Andrew Dunstan avatar Andrew Dunstan committed d308c18

Fix json_agg for no rows case.

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     StringInfo  state;
-    Assert( ! PG_ARGISNULL(0));
     /* cannot be called directly because of internal-type argument */
     Assert(AggCheckCallContext(fcinfo, NULL));
-    state = (StringInfo) PG_GETARG_POINTER(0);
+    state = PG_ARGISNULL(0) ? NULL : (StringInfo) PG_GETARG_POINTER(0);
+	if (state == NULL)
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